Daikin FTXA20A - P4-00 - Outdoor Unit: Malfunction of Radiating Fin Temperature Sensor; U0-00 - Outdoor Unit: Shortage of Refrigerant

1 | Troubleshooting
Service manual
27
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
Prerequisite: Stop the unit operation via the user interface.
8 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10VDC before proceeding.
9 Check that the thermal interface grease is applied properly on the (PCB or
refrigerant piping) contact surface of the heat sink. Adjust if needed.
Possible cause: Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
1.5.29 P4-00 – Outdoor unit: Malfunction of radiating fin temperature sensor
Trigger Effect Reset
Radiating fin thermistor
input is out of range.
Unit will stop operating. Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of the main PCB. See "2.12Main PCB"[491].
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
1.5.30 U0-00 – Outdoor unit: Shortage of refrigerant
Trigger Effect Reset
Refrigerant shortage
detected.
Unit will stop operating. Automatic reset.
Power reset via outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of all refrigerant side thermistors. See
"2.19Thermistors"[4144].
Possible cause: Faulty refrigerant side thermistor(s).